| Autor: |
Doyle, S M, Dupree, R, Howes, A P, Paul, D McK, Smith, M E |
| Zdroj: |
Bulletin of Materials Science; June 1991, Vol. 14 Issue: 3 p619-623, 5p |
| Abstrakt: |
Copper NMR has been studied as a function of temperature in a number of superconducting Nd2−xCexCuO4samples. The electric field gradient is very small and the Knight shift is 2380 ppm at room temperature, both of these implying that the copper is in a Cu+state. The Knight shift decreases with temperature particularly belowTc. The spin contribution to the Knight shift is estimated to be ∼ 200 ppm (about a factor ten smaller than in YBa2Cu3O7) indicating thatNs(EF) at the copper sites is small in this material. |
| Databáze: |
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